How to determine the absolute max min of a function on an open interval

The video tutorial explores the concept of graph analysis, focusing on sketching a parent graph and understanding the limits, maximum, and minimum values. It delves into the exploration of maximum values, highlighting the inability to calculate an absolute maximum due to the nature of the graph. The tutorial concludes with the realization that the graph has no absolute maximum, despite appearances.

Discuss the concept of limits as mentioned in the context of the graph.

Why does the teacher conclude that the graph has no absolute maximum?